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Show us your square wave
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egonotto:
Hello,

for contrast a 10 Hz signal with a PicoScope 5444B (1 MOhm input). The rise time is much better here, but the noise is much worse.

Best regards
egonotto
Aldo22:
@Performa01
@2N3055
@egonotto

Great, thanks for the information!  :-+
It's just a bit off-topic: "show us your highest frequency square wave that looks like a strong square wave" and "kind of curious to see what is the lowest price device is that can produce a really good looking square wave at 1, 5, 10, 20, and 30 MHz?"

I'll show something on-topic.
5MHz from DSO2000 (Scope + AWG)
Performa01:
Just to complete the SDG7102A topic: here is the fastest slope of 500 ps for both edges. With these settings, the instrument is operated outside its specs and actual rise time is a little slower. Apart from that, we’re starting to see Gibbs Ears in this capture – this is from the ~1.2 GHz reconstruction filter inside the AWG.

I have limited the acquisition bandwidth to 1.25 GHz. This doesn’t make any difference – except for cutting off all the HF noise above 1.25 GHz, because there is no meaningful output from the AWG above 1.2 GHz anyway.


SDS7404A_SDG7102A_Pulse_W10ns_RT500ps_BWL1.25GHz

The genuine resolution is “only” 12 bits, yet we can get a bunch of additional bits by filtering and/or averaging. The example above shows a noise-free ten-times zoom for close inspection of the pre-ringing.



--- Quote from: Aldo22 on June 11, 2024, 10:31:20 am ---It's just a bit off-topic: "show us your highest frequency square wave that looks like a strong square wave"

--- End quote ---

Not quite sure what qualifies as “strong square wave”, but if the criterion is that it can be easily identified as such, then I have an example here:


SDS7404A_Demo_Square_500MHz

This is a 500 MHz square wave coming from a SignalHound TG44A tracking generator. Certainly not the cleanest square wave around, yet with nice fast edges.
Electro Fan:

--- Quote from: Performa01 on June 11, 2024, 12:40:01 pm ---Not quite sure what qualifies as “strong square wave”, but if the criterion is that it can be easily identified as such, then I have an example here:



--- End quote ---

About 9.5 years after the original post “can be easily identified as such“ sounds like a reasonable criterion to me :)
EF
Performa01:

--- Quote from: Electro Fan on June 11, 2024, 09:53:54 pm ---About 9.5 years after the original post

--- End quote ---

Huh?
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